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by trackcoach
Thu May 08, 2008 1:23 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: The Dark Tower; density? (APOD 08 May 2008)
Replies: 17
Views: 6531

Density of the Dark Tower?

My students want to get an idea of the density of the Dark Tower and other features like reflection and emmision nebulae.